Till and Rafael,
Here are some updates:
The server ISPConfig3 is up and running, I have one customer set up with website and also email. When I go to the domain name of the client "www.lospctecs.com" I get the default index page from ISPConfig3 successfully.
Question1: If I have a site do I upload the site manually using rsync or ftp CLI? or there is a GUI tool on ISPConfig3 for administrators to do it?
Question2: I can send emails but still can't receive them at this point I don't get any more messages about "Delivery Status Notification (Failure)" I just don't get any messages back but I don't receive the messages in the "firstname.lastname@example.org" account on the web mail squirrel main => www.lospctecs.com/webmail
Question3: If I am using the domain provider godaddy, is this correct in the configuration of the DNS, MX and other CNAMEs?
Question4: If I use dig lospctecs.com
Is this what I suppose to received back? I believe something is missing or misconfiguration... please help
Here I am showing the name servers of the godaddy account for lospctecs.com domain.
Question5: Can I use the IP static of the ISPConfig3 server as the IP to the MAIL server (postfix), FTP, DNS --> NS1 server or do I need to use the NS65.domaincontrol.com and NS66.domaincontrol.com as the godaddy is the domain name provider?
I am sure I am very close to understand what the issue is! I am really trying to read how DNS and MX records works and how they need to be configure when working with ISP providers and clients! Thank you!!!